doc: update README with examples

Signed-off-by: Noah Watkins <noahwatkins@gmail.com>

README.md

@@ -11,18 +11,56 @@ The native RADOS library and development headers are expected to be installed.
 Detailed documentation is available at
 <http://godoc.org/github.com/noahdesu/go-rados>.
 
-## Example
+### Connecting to a cluster
 
-Connect to a cluster and list the pools:
+Connect to a Ceph cluster using a configuration file located in the default
+search paths.
 
 ```go
 conn, _ := rados.NewConn()
 conn.ReadDefaultConfigFile()
 conn.Connect()
-pools, _ := conn.ListPools()
-fmt.Println(len(pools), pools)
 ```
 
-will print:
+A connection can be shutdown by calling the `Shutdown` method on the
+connection object (e.g. `conn.Shutdown()`). There are also other methods for
+configuring the connection. Specific configuration options can be set:
 
-    3 [data metadata rbd]
+```go
+conn.SetConfigOption("log_file", "/dev/null")
+```
+
+and command line options can also be used using the `ParseCmdLineArgs` method.
+
+```go
+args := []string{ "--mon-host", "1.1.1.1" }
+err := conn.ParseCmdLineArgs(args)
+```
+
+For other configuration options see the full documentation.
+
+### Pool maintenance
+
+The list of pools in a cluster can be retreived using the `ListPools` method
+on the connection object. On a new cluster the following code snippet:
+
+```go
+pools, _ := conn.ListPools()
+fmt.Println(pools)
+```
+
+will produce the output `[data metadata rbd]`, along with any other pools that
+might exist in your cluster. Pools can also be created and destroyed. The
+following creates a new, empty pool with default settings.
+
+```go
+conn.MakePool("new_pool")
+```
+
+Deleting a pool is also easy. Call `DeletePool(name string)` on a connection object to
+delete a pool with the given name. The following will delete the pool named
+`new_pool` and remove all of the pool's data.
+
+```go
+conn.DeletePool("new_pool")
+```